Nonicing throttle valve



H. EBERHARDT Jan. 29, 1946-.

NONICING-THROTTLE VALVE Filed Oct. 15, 1945 FIG. 3.

INVENTOR. HOWARD EBERHARDT /z /aW Patented Jan. 29, 1946 UNITED STATES PATENT OFFICE N ONICIN G THROTTLE VALVE Howard Eberhardt, Webster Groves, Mo., assignor to Carter Carburetor Corporation, St. Louis, Mo., a corporation of Delaware Application October 15, 1943, Serial No. 506,451 2 Claims. (CL 261- 41) This invention relates to ice resisting throttle valves for internal combustion engines.

A carburetor of this type is customarily provided with a butterfly throttle valve for controlling the discharge of combustible mixture to the engine cylinders, and an idling port located so as to discharge posterior to 'the throttle, when closed. In the normal idling position of the valve, the throttle is" held slightlyrmenso that the air which passes the ,samejmixesgwith-the very rich mixture emitting from the p i-no form the combustible idling mixture. The air which passes around the throttle expands-."greatly, producing a refrigerating effect upon the throttle plate and". this effect is enhanced by the vaporization ofthe idling ports I1 and I8, port i8 being provided with a mixture adjusting screw l9. v

A shaft 22 is journalled in the barrel wall substantially at the level of port l1 and has opposite flat sides to which are secured the spaced throttle valve discs 23 and 24. Lower disc 24 extends radially beyond upper disc 23 and, in theidling position, as shown in Fig. 1, splits idling port IT so that a portion thereof opens into the barrel posterior to the throttle valve. In this position ofv the throttle, plate 24 is slightly spaced from the barrel wall to admit idling air to the cylinf"; ders. During the first part of the opening and idling fuel. Under low't'emperatureconditions, 1

particularly before the euginebecomes fully heated, this refrigeration of the throttle valve frequently causes condensation and freezing of the.

moisture content of the entering air and the resulting ice crystals may" seriously restrictthe idling port so stalls.

The main object of the design a throttle valve which-wfllsubstantially -lowitem-para.-

resist the formation of ice and tureidling conditions andfth e idling and stalling atsuehiti es.

In the accompanying"drawin'giwhich illustrates w Fig. 1 is a sectional viewfof 'a carburetor inthe invention cluding the novel ice resisting. throttle valve shown in idling position.

Fig. 2 is a perspective view of the throttle'valve disassembled from the carburetor.

Fig. 3 is an enlarged side view of the lower part of the carburetor showing the throttle operating barrel through a main metering orifice l2 and upwardly inclined main fuel passage l3 discharging into smallest venturi 6 by means of a main nozzle H. An idling passage i extends upwardly from main fuel passage I 3 and thence downwardthat theengine fires .erratically'or the last part of the closing movement of the throttle, the posterior, larger disc24 sweeps port I I! so as to control the idling discharge.

One end of throttle shaft 22 extends outside of the barrel and rigidly mounts an arm 25 to which is secured a link zt extending to the accelerator pedal located in the drivers compartment. A pair of cars 21 on the arm 'mount a represented at 30. e

. 'It has been found that this form of throttle 'valve,"having anairlayerbetween spaced discs, the anterior disc shields the, port controlling screw 28 which cooperates with a fixed stop 29 to adjust the idling position of the throttle valve ,and, consequently, the idling speed of they engine.

A throttle retum spring is diagrammatically posterior disc and substantially resists and dela'ysthe formation of ice crystals on the posterior;

1 disc and around the idling port so that no idling .-.diificulties are experienced as'a result of icing at any temperature. The invention has particular advantage fwhenused with automotive carburetors, in which icing ordinarily usually occurs only before the engine reaches normal running heat after starting. The novel throttle valve effectively prevents the formation of ice during this warming up period.

Experiments have further shown that a throttle provided with an air layer between the discs is much more efl'ective for this purpose than one having an intermediate layer of insulating ma terial such as asbestos. The invention may be modified in various respects as will occur to those skilled in the art and the exclusive use of all ly as at l6 and discharges into the barrel through modifications as come within the scope of the appended claims is contemplated.

I claim: a

1. In a carburetor, means forming a mixing conduit having a main fuel nozzle and an idle port posterior to said nozzle, a throttle shaft transversely mounted in the walls of said mixture conduit, a throttle valve comprising a posterior annexed to said shaft and having an edge constructed and arranged to substantially close said Y mixing conduit and to sweep said port, and an anterior disk carried by said throttle shaft in a position substantially parallel to but spaced from said throttle.

2. In -a carb,uretor,a mixture conduit having athrottle valve comprising spaced discs with an air layer therebetween, one. of said discs extend- T ing radially a slight distance; beyond the other,

asasneo 1 I and an idling port in the wall or said conduit adjacent'the edge or; said largerdisc which moves anteriorly during openinz'of the throttle so as to be swept by said larger disc for conti'ollln the idling fuel discharge, said smaller disc shielding 

